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•
Constant current lamp driver based on OPA567 and monitored by INA213
– Detector board
•
Low-noise differential amplifier circuit
•
ADS1255 30 kSPS analog-to-digital converter (ADC) with SPI
•
TMP006 thermopile sensor for detector and ambient temperature measurement
•
1-mm non-cooled Hamamatsu G12180-010A InGaAs photodiode
– DMD board
•
DLP2010NIR near-infrared digital micromirror device
Figure 1-1
shows the NIRscan Nano hardware block diagram.
Microcontroller Board
Bluetooth
CC2564MODN
Exp
Conn
Battery
Charger
BQ24250
Power
Management
TPS63036
TPS81256
TPS82671
TPS386596
TPS22904
*Thermistor Not Included
T
Li-Polymer
Battery*
*Battery Not Included
1.2.1 Optical Engine
The DLP NIRscan Nano EVM spectrometer optical engine is mounted on top of the electronics
subsystem. The configuration is a post-dispersive architecture with a removable reflectance sample
module. The reflectance module includes two lens-end broadband tungsten filament lamps. In this specific
implementation, depicted in
reflectance head. During a scan, the sample absorbs a specific amount of NIR light and diffusely reflects
the non-absorbed light into the system. The amount of light absorbed at each wavelength is dependent on
the molecular makeup of the material, and is specific to that material, a chemical fingerprint. The light
diffusely reflected from the sample is gathered by the collection lens and focused into the optical engine
DLPU030B – June 2015 – Revised July 2015
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ARM
10pin header
UART3
JTAG
SSSI3
Microprocessor
UART4
TM4C129
SSI0
USB Slave
I2C9
SSI2
I2C2
24bit RGB
DLP Controller Board
Flash
SPI
I2C
24bit RGB
Triggers
LVDS
DLP Controller
DLPC150
SPI
Ctrl
Lamp Driver
TPS81256
Figure 1-1. DLP NIRscan Nano Block Diagram
Figure
1-2, a sample is placed against the sapphire front window of the
Copyright © 2015, Texas Instruments Incorporated
LEDs
On/Off
GPIOs
SDRAM
EPI0
AS4C16M16S (32MB)
Hum & Temp Sensor
I2C6
HDC1000
SSI1
I2C7
DMD Board
24-bit ADC
ADS1255
PMIC
Amplifier
DLPA2005
DMD Flex
OPA2376
SPI
IR Temp
Ctrl
TMP006
Amp
OPA350
2.5V Ref
REF5025
Detector Board
SENS
INA213
OPA567
What is the DLP NIRscan Nano EVM?
Buttons
Scan/BT Pair
Sample
Reflective
Module
LEGEND
Processor
Interface
RF/IF
Amplifier
DLP NIRscan Nano Overview
Logic
Power
ADC/DAC
Clocks
Others
9
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